To make the cauliflower "rice," wash the head of cauliflower and remove the outer leaves and stem. Roughly chop the florets and place them in a food processor. Pulse the cauliflower in the food processor until the pieces are the size of pieces of rice. Transfer to a bowl and toss with the rest of the rice ingredients. Set aside until you are ready to make the rolls.
To build the rolls, place 1 sheet of the sushi nori on a sushi mat. Line with the lettuce leaves to keep the nori sheet from getting soggy. Spread out a layer of the cauliflower rice, and then top with some of the julienned carrot, avocado, julienned cucumber, avocado slices and about 1 tablespoon of the chopped green onion. Roll tightly in the sushi mat and seal closed with a little bit of water at the edge of the overlapping nori.
Cut into ½" slices. Repeat with 3 more rolls.
Recipe by Plant Craft at https://www.rachelcarr.com/kimchee-nori-roll-raw-vegan/